Fix parsing of double dot operators for FormCalc

testing/SUPPRESSIONS

 # Copyright 2016 The PDFium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 # List of tests to be skipped, one per line.
 # There are four space-separated columns per line
 # Each column (except column 0) can contain a comma-separated list of values.
 #
 # Column 0: test file name
 # Column 1: platform: *, win, mac, linux
@@ skipping 269 matching lines @@
 all_trigger_newdoc.pdf * * *
 all_trigger_print.pdf * * *
 all_trigger_run_js_lunchurl.pdf mac * *
 all_trigger_run_js_maildoc.pdf mac * *
 app_launchurl.pdf mac * *
 appstoredescription3.1_en_updated.pdf mac * *
 bookmark.pdf * * *
 bookmarkgetcolor.pdf mac * *
 bug_0_length_line.pdf mac * *
 bug_0_width_line.pdf mac * *
+bug_434.pdf * * noxfa
+bug_434.pdf win * xfa
 bug_white_space.pdf mac * *
 calcorderindex_test.pdf * * *
 calculate_average.pdf mac * *
 calculate_order.pdf * * *
 calculate_sum_a_b_c.pdf mac * *
 calculate_validate.pdf mac * *
 calculate_validate.pdf * nov8 *
 ch_1.pdf * * *
 check_box.pdf * * *
 color.pdf mac * *
@@ skipping 168 matching lines @@
 text_field_multiline_line_spacing.pdf mac * *
 thread_action.pdf mac * *
 time.pdf mac * *
 transformation.pdf mac * *
 transparent.pdf mac * *
 whats_new_in_v3.0.pdf mac * *
 widget_javascript.pdf mac * *
 zh_file1.pdf mac * *
 zh_function_list.pdf mac * *
 zh_shared_document.pdf mac * *